this Setra pressure sensor pricing starts at $1738.00 I wouldn't call that inexpensive.

What I would call inexpensive ($58) is the TI eZ420-Chronos Development tool which includes a MSP430 series micropower microprocessor in a watch case with Bluetooth link to your PC. Besides a built-in temperature sensor, a 3-axis accelerometer, it also includes a pressure sensor which can read the height of your head, right out of the box. Mind you it wouldn't be accurate enough for serious weather measurements of barometric pressure.

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